This booklet consists of JPEG-format versions of the page images which have been wrapped up into a PDF for uploading. This was done twice, once at a JPEG "quality" setting of 90 (which gives a 157 Megabyte original PDF) and again at a setting of 75 (which gives a 77 Megabyte original PDF). The "75 percent" versions are all identified with the string "-q75" in their filenames. For ordinary viewing purposes, it probably doesn't matter which version you use.
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